Fig. 6.

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Rotational support as a function of redshift, measured as the ratio of the velocity at the effective radius and the constant velocity dispersion: v(re)/σ0. Although studies based on ground-based near-infrared data (as described in Fig. 5) have found a clear, gradual decline in v/σ toward higher redshift, we find an interesting diversity among our sample of low-mass galaxies, with dynamically cold discs existing possibly as early as z ∼ 7.
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